Drew DeVoursney was found strangled to death with his girlfriend, Francesca Matus, on Monday in Belize. (GoFundMe)

A U.S. Marine veteran and his Canadian girlfriend whose bodies were found this week in Belize died of strangulation, police said Tuesday.

The bodies of Drew DeVoursney, 36, and Francesca Matus, 52, turned up in a sugar cane field in an "advanced state of decomposition" a week after they went missing, The Toronto Star reported. DeVoursney's body was on top of Matus' and both had duct tape wrapped around their wrists.

The couple was last seen leaving Scotty's Bar and Grill in Corozal the night of April 25. Matus was scheduled to fly back to Toronto the next day. A friend reported them missing after he went to Matus' home to drive her to the airport and couldn't find her. Matus' car was also gone.

The U.S. Bureau of Consular Affairs told the newspaper that it was "aware of reports" that a citizen had died in Belize, but did not comment further. Global Affairs Canada offered its condolences and said officials are working with authorities in Belize to gather more information.

DeVoursney's mom, Cher, said the U.S. Embassy in Belize informed her of her son's death. DeVoursney, who is from Atlanta, served several tours in Iraq and had been in Belize since December.